body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
}

.container {
    background: #f5f5f5;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.input-group {
    margin: 20px 0;
}

input[type="number"] {
    padding: 10px;
    width: 200px;
    margin-right: 10px;
    border: 2px solid #4CAF50;
    border-radius: 4px;
}

button {
    padding: 10px 20px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.result-box {
    padding: 15px;
    background: white;
    border-left: 5px solid #4CAF50;
    margin: 20px 0;
}

.loading {
    display: none;
    text-align: center;
    margin: 30px 0;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4CAF50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#priceChart {
    margin-top: 30px;
    background: white;
    padding: 15px;
    border-radius: 8px;
}